Lake Shore Model 340 Temperature Controller User’s Manual
Remote Operation 9-25
QTST? Query Self-Test
Input: *TST?
Returned: 0 or 1. Format: n[term]
Remarks: The Model 340 performs a self-test at power-up. 0 = no errors found, 1 = errors found.
QWAI Wait-to-Continue
Input: *WAI
Returned: Nothing
Remarks: This command is not supported in the Model 340.
ALARM Configure Input Alarm Parameters
Input: ALARM <input>, [<off/on>], [<source>], [<high value>], [<low value>],
[<latch enable>], [<relay>]
Returned: Nothing
Remarks: Configures the alarm parameters for an input.
<input> Specifies which input to configure.
<off/on> Determines whether the instrument checks the alarm for this input.
<source> Specifies input data to check. Valid entries: 1 = kelvin, 2 = Celsius,
3 = sensor units, 4 = linear data.
<high value> Sets the value the source is checked against to activate the high alarm.
<low value> Sets the value the source is checked against to activate low alarm.
<latch enable> Specifies a latched alarm (remains active after alarm condition correction).
<relay enable> Specifies how the activated alarm affects relays. NOTE: Does not
guarantee the alarm activates the relays. See the RELAY command.
Example: ALARM A, 0[term] - Turns off alarm checking for Input A.
ALARM B, 1, 1, 270.0, ,1[term] - Turns on alarm checking for input B, activates high alarm if
kelvin reading is over 270, and latches the alarm when kelvin reading falls below 270.
ALARM? Query Input Alarm Parameters
Input: ALARM? <input>
Returned: <off/on>, <source>, <high value>, <low value>, <latch enable>, <relay enable>
Format: n,n,±nnn.nnnE±n,±nnn.nnnE±n,n,n[term]
Remarks: Returns the alarm parameters of an input. See the ALARM command for parameter
descriptions. <input> specifies which input to query.
ALARMST? Query Input Alarm Status
Input: ALARMST? <input>
Returned: <high status>, <low status>. Format: n,n[term]
Remarks: Returns the alarm status of an input. <input> specifies which input to query.
ALMRST Clear Alarm Status for All Inputs
Input: ALMRST
Returned: Nothing
Remarks: Clears both the high and low status of all alarms, including latching alarms.
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